<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">

<script type="text/javascript" src="webgl-utils.js"></script>
<script type="text/javascript">
/* Disable Test
 *
 * If we succeed in getting a WebGL context, we will fill
 * the canvas with red. If we fail to acquire a WebGL context,
 * we will use Canvas2D to instead fill it with green.
 *
 * Note that this test differs from the others in that
 * it will draw differently if it receives a WebGL context.
 * Other tests are designed to fallback silently to Canvas2D.
 *
 * We use this test to assure that when we disable WebGL,
 * WebGL does not function. This is trivially true for systems
 * that don't support WebGL. This test is not viable for testing
 * that WebGL works, as blocklisted systems will always draw green.
 */

"use strict";

function renderGL(gl) {
  gl.clearColor(1.0, 0.0, 0.0, 1.0);
  gl.clear(gl.COLOR_BUFFER_BIT);
  gl.finish();
}

function renderBackup(canvas) {
  var context = canvas.getContext("2d");
  context.fillStyle = "rgba(0, 255, 0, 1.0)";
  context.fillRect(0, 0, 256, 256);
}

function runTest() {
  var canvas = document.getElementById("canvas");
  var gl = initGL(canvas);

  if (gl)
    renderGL(gl);
  else
    renderBackup(canvas);

  waitForComposite(testComplete);
}

function testComplete() {
  document.documentElement.removeAttribute("class");
}
</script>
</head>

<body onload="rAF(runTest);">
  <canvas id="canvas" width="256" height="256"></canvas>
</body>

</html>
